ATSAME70Q21 - custom bootloader fails -jumps to application.

[Aravindh1910]

Discussed in #60366

I am also working on similar application on ATSAME70Q21.
I am using mcuboot as bootloader and helloworld as my application. Now I am facing similar kind of issue discussed in above thread. In my case, Bootloader is Jumping to the corresponding address of the application , after that I am facing memory usage issue,

The following is (.lst) file (where it gets blocked)

/* do byte-sized copying until finished */

while (n > 0) {

4437ae: 1e43 subs r3, r0, #1
4437b0: 440a add r2, r1
{
4437b2: b510 push {r4, lr}
while (n > 0) {
4437b4: 4291 cmp r1, r2
4437b6: d100 bne.n 4437ba <memcpy+0xc>
*(d_byte++) = *(s_byte++);
n--;
}

return d;

}
4437b8: bd10 pop {r4, pc}
*(d_byte++) = *(s_byte++);
4437ba: f811 4b01 ldrb.w r4, [r1], #1
4437be: f803 4f01 strb.w r4, [r3, #1]!
n--;
4437c2: e7f7 b.n 4437b4 <memcpy+0x6>

can any help m out ?

@pavithvishnu are you be to jump to the application.
@Laczen can you help me out

[github-actions[bot]]

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Even though I'm a bot, I can assure you that the whole community is genuinely grateful for your time and effort. 🤖💙

[Laczen]

@Aravindh1910, for my understanding: when you compile and flash hello_world without mcuboot everything works as expected ?

[Aravindh1910]

@Laczen Yes, If I compile hello_world and flashed it without mcuboot it works!

[Aravindh1910]

@Laczen and @pavithvishnu,
I have a findings below,

1. able to compile hello_world and Flash it without mcuboot it works.
2. able to compile and flash hello_world with mcuboot (without USB enabled) it works!.
3. able to compile and flash hello_world with mcuboot (with USB enabled) it doesn't worked!.

To summarize, if I enabled USB in Configuration, jump from mcuboot to Application doesn't work.
But, For my requirement I need to enable USB. USB configured as below.

filename : board_defconfig
CONFIG_USB_DEVICE_STACK=y
CONFIG_USB_DEVICE_HID=y
CONFIG_ENABLE_HID_INT_OUT_EP=y
CONFIG_HID_INTERRUPT_EP_MPS=256

May I know How to disable this before jump to application.
(FYI, usb_disable API also not works)

[Laczen]

@jfischer-no, @nordicjm, could there be something missing in mcuboot that causes this malfunction ?

[pavithvishnu]

@Aravindh1910 you are right, I have also tried with the same configuration which you have mentioned above. I'm also facing the same issue. if usb stack is enable, jump to application is not working.

[Aravindh1910]

@Laczen @jfischer-no @nordicjm @fabiobaltieri
May I know, is there any update and information available? How to debug further.

[jfischer-no]

Whenever I trying to use USB at mcuboot (Not actually called any USB APIs , initially including CONFIG_USB_DEVICE_STACK=y in configuration) makes problem.

In use of Debugger found that system execution jumps to the application memory area (i.e., 0x0044xxxx - as mentioned in above image - unknown at 0x004437BE).

Why do you assume the problem is USB support and not your bootloader configuration? Btw, MCUboot configuration is not part of Zephyr tree. Is your MCUboot configuration still working if you enable MULTITHREADING, IMG_MANAGER, STREAM_FLASH but not USB_DEVICE_STACK?

[Aravindh1910]

As mentioned, I have enabled the MULTITHREADING, IMG_MANAGER without enabling USB STACK, It working as expected, able to jump to the application.

Only If I enable the USB_DEVICE_STACK. I’m facing the issue. Which clearly show that enabling the USB Stack is casing the issue.

[jfischer-no]

As mentioned, I have enabled the MULTITHREADING, IMG_MANAGER without enabling USB STACK, It working as expected, able to jump to the application.

Where did you mention "I have enabled the MULTITHREADING, IMG_MANAGER without enabling USB STACK" before ?

Only If I enable the USB_DEVICE_STACK. I’m facing the issue. Which clearly show that enabling the USB Stack is casing the issue.

Okay, good luck.

[Aravindh1910]

There is miscommunication, I meant to say that, "As you have mentioned - Is your MCUboot configuration still working if you enable MULTITHREADING, IMG_MANAGER, STREAM_FLASH but not USB_DEVICE_STACK?"

I have enabled those configurations without USB_DEVICE_STACK it is working.
only it is failing if USB_DEVICE_STACK enabled.

[Aravindh1910]

@jfischer-no Is there any further update on this topic...? it would be great if any documents or links available related to this topic.

[Laczen]

@Aravindh1910 , @pavithvishnu , as this is a usb/mcuboot problem I can't help you (it might be a configuration problem, a driver problem, unsupported, ...). As you have identified the problem at least one of the discussions can be closed.

The correct persons to address this problem are @jfischer-no (USB) and @nordicjm (zephyr-mcuboot).

[nordicjm]

Not seen any issues with this with other boards, sounds like something for @nandojve to investigate as it is atmel-specific. @photonthunder might have some ideas about USB support on atmel.

[photonthunder]

I haven't played with the USB portion of these Atmel devices, but I have observed problems when the clock configuration or other device settings are changed between the bootloader and the application (problems I have observed outside of Zephyr).

[pavithvishnu]

@Aravindh1910 is there any further updates on this....?